Year	Number
1996	-0.117616765201092
1998	0.152408421039581
2000	0.110470913350582
2002	-0.153443366289139
2003	0.0445495285093784
2004	0.00536269648000598
2005	-0.123797461390495
2006	-0.110259488224983
2007	-0.139065206050873
2008	-0.326152890920639
2009	-0.83152848482132
2010	-0.845434308052063
2011	-0.879346013069153
2012	-0.883270680904388
2013	-0.763357222080231
2014	-0.500149726867676
2015	-0.380756258964539
2016	-0.316467642784119
2017	-0.345090419054031
2018	-0.321327120065689
2019	-0.234669491648674
2020	-0.261799514293671
2021	-0.273578017950058
2022	-0.28731495141983